title: Deficiency of mouse CD4+CD25+Foxp3+ regulatory T cells in xenogeneic pig thymus-grafted nude mice suffering from autoimmune diseases.
abstract: Xenogeneic thymus transplantation can efficiently induce specific immune tolerance to donor antigens in athymic recipients. However, many nude mice suffer from autoimmune diseases (AID) for over 10 weeks after xenogeneic thymus transplantation. CD4+CD25+Foxp3+ regulatory T (Treg) cells were recently determined to play a pivotal role in keeping immune tolerance in humans and mice. Thus, we investigated this subpopulation of Treg cells in the periphery of pig thymus-grafted nude mice suffering from AID. Our results showed that the expression of Foxp3, CTLA-4 and GITR on mouse CD4+CD25+ T cells and the ratio of CD4+CD25+Foxp3+ Treg cells to CD4+ T cells were significantly decreased in the periphery of pig thymus-grafted nude mice suffering from AID, compared with healthy pig or mouse thymus-grafted nude mice. Furthermore, mouse CD4+CD25+ T cells in pig thymus-grafted nude mice suffering from AID showed more severe deficiency in immunosuppressive function compared with the counterpart in xenogeneic pig or syngeneic thymus-grafted nude mice without AID. Thus, the decreased frequency, altered phenotype and functional deficiency of mouse CD4+CD25+ Treg cells in pig thymus-grafted nude mice may contribute to the development of AID in this model.
authors.affiliation: Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Baojun
authors.initials: B
authors.lastname: Zhang
authors.forename: Chenming
authors.initials: C
authors.lastname: Sun
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Qu
authors.forename: Aijun
authors.initials: A
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Lianjun
authors.initials: L
authors.lastname: Zhang
authors.forename: Zeqing
authors.initials: Z
authors.lastname: Niu
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000276:immunology; D001327:Autoimmune Diseases / Q000276:immunology* / Q000473:pathology; D015704:CD4 Antigens / Q000276:immunology*; D060908:CTLA-4 Antigen; D051858:Forkhead Transcription Factors / Q000276:immunology*; D053450:Glucocorticoid-Induced TNFR-Related Protein; D053645:Interleukin-2 Receptor alpha Subunit / Q000276:immunology*; D051379:Mice; D008819:Mice, Nude; D017475:Receptors, Nerve Growth Factor / Q000276:immunology; D018124:Receptors, Tumor Necrosis Factor / Q000276:immunology; D013552:Swine; D050378:T-Lymphocytes, Regulatory / Q000276:immunology* / Q000473:pathology; D013950:Thymus Gland / Q000276:immunology* / Q000637:transplantation
chemical_list: D015703:Antigens, CD; D015704:CD4 Antigens; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; C556707:Ctla4 protein, mouse; D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D053450:Glucocorticoid-Induced TNFR-Related Protein; D053645:Interleukin-2 Receptor alpha Subunit; D017475:Receptors, Nerve Growth Factor; D018124:Receptors, Tumor Necrosis Factor; C106544:Tnfrsf18 protein, mouse